Securities (Tables)

9 Months Ended

Sep. 30, 2013

Securities

Schedule of amortized cost, unrealized gains and losses and fair values of securities classified available for sale and held to maturity

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
September 30, 2013:	Cost		Gains		Losses			Value
	(dollars in thousands)
Available for sale
U.S. Treasury securities	$	103,024	$	385	$	(71	)	$	103,338
Obligations of U.S. government corporations and agencies	285,452		3,258		(341		)	288,369
Obligations of states and political subdivisions	292,492		3,258		(2,463		)	293,287
Residential mortgage-backed securities	185,584		4,802		(253		)	190,133
Corporate debt securities	25,407		115		(32		)	25,490
Total debt securities	891,959		11,818		(3,160		)	900,617
Mutual funds and other equity securities	4,650		2,155		—			6,805
Total	$	896,609	$	13,973	$	(3,160	)	$	907,422

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
September 30, 2013:	Cost		Gains		Losses		Value
	(dollars in thousands)
Held to maturity
Obligations of states and political subdivisions	$	838	$	6	$	—	$	844
Total	$	838	$	6	$	—	$	844

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
December 31, 2012:	Cost		Gains		Losses			Value
	(dollars in thousands)
Available for sale
U.S. Treasury securities	$	103,353	$	1,303	$	—		$	104,656
Obligations of U.S. government corporations and agencies	363,583		6,616		(5		)	370,194
Obligations of states and political subdivisions	274,350		6,176		(238		)	280,288
Residential mortgage-backed securities	210,139		7,576		—			217,715
Corporate debt securities	24,601		139		(26		)	24,714
Total debt securities	976,026		21,810		(269		)	997,567
Mutual funds and other equity securities	2,451		1,479		—			3,930
Total	$	978,477	$	23,289	$	(269	)	$	1,001,497

Schedule of amortized cost and fair value of debt securities available for sale and held to maturity by contractual maturity

	Available for sale				Held to maturity
	Amortized		Fair		Amortized		Fair
	Cost		Value		Cost		Value
	(dollars in thousands)				(dollars in thousands)
Due in one year or less	$	151,701	$	152,776	$	—	$	—
Due after one year through five years	478,362		481,436		234		235
Due after five years through ten years	182,805		185,574		496		499
Due after ten years	79,091		80,831		108		110
Total	$	891,959	$	900,617	$	838	$	844

Schedule of realized gains and losses related to sales of securities available for sale

	Three Months Ended September 30,
	2013		2012
	(dollars in thousands)
Gross security gains	$	82	$	511
Gross security (losses)	—		—
Net security gains	$	82	$	511

	Nine Months Ended September 30,
	2013		2012
	(dollars in thousands)
Gross security gains	$	82	$	576
Gross security (losses)	—		(1		)
Net security gains	$	82	$	575

Schedule of securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in continuous loss position

	Less than 12 months				Greater than 12 months				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
September 30, 2013:	Value		Losses		Value		Losses		Value		Losses
	(dollars in thousands)
Available for sale
U.S. Treasury securities	$	36,520	$	71	$	—	$	—	$	36,520	$	71
Obligations of U.S. government corporations and agencies	25,264		341		—		—		25,264		341
Obligations of states and political subdivisions	116,930		2,399		4,582		64		121,512		2,463
Residential mortgage-backed securities	15,183		253		—		—		15,183		253
Corporate debt securities	9,354		32		—		—		9,354		32
Total temporarily impaired securities	$	203,251	$	3,096	$	4,582	$	64	$	207,833	$	3,160

	Less than 12 months				Greater than 12 months				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
September 30, 2013:	Value		Losses		Value		Losses		Value		Losses
	(dollars in thousands)
Held to maturity
Obligations of states and political subdivisions (1)	$	183	$	—	$	—	$	—	$	183	$	—
Total temporarily impaired securities	$	183	$	—	$	—	$	—	$	183	$	—

(1) Unrealized loss was less than one thousand dollars.

	Less than 12 months				Greater than 12 months				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2012:	Value		Losses		Value		Losses		Value		Losses
	(dollars in thousands)
Available for sale
Obligations of U.S. government corporations and agencies	$	10,155	$	5	$	—	$	—	$	10,155	$	5
Obligations of states and political subdivisions	37,958		189		3,311		49		41,269		238
Corporate debt securities	15,207		26		—		—		15,207		26
Total temporarily impaired securities	$	63,320	$	220	$	3,311	$	49	$	66,631	$	269